704 lines
23 KiB
Python
704 lines
23 KiB
Python
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import re
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import io
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import os
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import sys
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import codecs
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from weakref import WeakKeyDictionary
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PY2 = sys.version_info[0] == 2
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CYGWIN = sys.platform.startswith('cygwin')
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# Determine local App Engine environment, per Google's own suggestion
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APP_ENGINE = ('APPENGINE_RUNTIME' in os.environ and
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'Development/' in os.environ['SERVER_SOFTWARE'])
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WIN = sys.platform.startswith('win') and not APP_ENGINE
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DEFAULT_COLUMNS = 80
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_ansi_re = re.compile(r'\033\[((?:\d|;)*)([a-zA-Z])')
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def get_filesystem_encoding():
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return sys.getfilesystemencoding() or sys.getdefaultencoding()
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def _make_text_stream(stream, encoding, errors,
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force_readable=False, force_writable=False):
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if encoding is None:
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encoding = get_best_encoding(stream)
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if errors is None:
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errors = 'replace'
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return _NonClosingTextIOWrapper(stream, encoding, errors,
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line_buffering=True,
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force_readable=force_readable,
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force_writable=force_writable)
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def is_ascii_encoding(encoding):
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"""Checks if a given encoding is ascii."""
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try:
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return codecs.lookup(encoding).name == 'ascii'
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except LookupError:
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return False
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def get_best_encoding(stream):
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"""Returns the default stream encoding if not found."""
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rv = getattr(stream, 'encoding', None) or sys.getdefaultencoding()
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if is_ascii_encoding(rv):
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return 'utf-8'
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return rv
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class _NonClosingTextIOWrapper(io.TextIOWrapper):
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def __init__(self, stream, encoding, errors,
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force_readable=False, force_writable=False, **extra):
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self._stream = stream = _FixupStream(stream, force_readable,
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force_writable)
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io.TextIOWrapper.__init__(self, stream, encoding, errors, **extra)
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# The io module is a place where the Python 3 text behavior
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# was forced upon Python 2, so we need to unbreak
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# it to look like Python 2.
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if PY2:
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def write(self, x):
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if isinstance(x, str) or is_bytes(x):
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try:
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self.flush()
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except Exception:
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pass
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return self.buffer.write(str(x))
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return io.TextIOWrapper.write(self, x)
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def writelines(self, lines):
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for line in lines:
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self.write(line)
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def __del__(self):
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try:
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self.detach()
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except Exception:
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pass
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def isatty(self):
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# https://bitbucket.org/pypy/pypy/issue/1803
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return self._stream.isatty()
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class _FixupStream(object):
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"""The new io interface needs more from streams than streams
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traditionally implement. As such, this fix-up code is necessary in
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some circumstances.
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The forcing of readable and writable flags are there because some tools
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put badly patched objects on sys (one such offender are certain version
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of jupyter notebook).
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"""
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def __init__(self, stream, force_readable=False, force_writable=False):
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self._stream = stream
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self._force_readable = force_readable
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self._force_writable = force_writable
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def __getattr__(self, name):
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return getattr(self._stream, name)
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def read1(self, size):
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f = getattr(self._stream, 'read1', None)
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if f is not None:
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return f(size)
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# We only dispatch to readline instead of read in Python 2 as we
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# do not want cause problems with the different implementation
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# of line buffering.
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if PY2:
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return self._stream.readline(size)
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return self._stream.read(size)
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def readable(self):
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if self._force_readable:
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return True
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x = getattr(self._stream, 'readable', None)
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if x is not None:
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return x()
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try:
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self._stream.read(0)
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except Exception:
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return False
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return True
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def writable(self):
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if self._force_writable:
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return True
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x = getattr(self._stream, 'writable', None)
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if x is not None:
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return x()
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try:
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self._stream.write('')
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except Exception:
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try:
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self._stream.write(b'')
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except Exception:
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return False
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return True
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def seekable(self):
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x = getattr(self._stream, 'seekable', None)
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if x is not None:
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return x()
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try:
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self._stream.seek(self._stream.tell())
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except Exception:
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return False
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return True
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if PY2:
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text_type = unicode
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bytes = str
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raw_input = raw_input
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string_types = (str, unicode)
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int_types = (int, long)
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iteritems = lambda x: x.iteritems()
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range_type = xrange
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def is_bytes(x):
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return isinstance(x, (buffer, bytearray))
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_identifier_re = re.compile(r'^[a-zA-Z_][a-zA-Z0-9_]*$')
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# For Windows, we need to force stdout/stdin/stderr to binary if it's
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# fetched for that. This obviously is not the most correct way to do
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# it as it changes global state. Unfortunately, there does not seem to
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# be a clear better way to do it as just reopening the file in binary
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# mode does not change anything.
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#
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# An option would be to do what Python 3 does and to open the file as
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# binary only, patch it back to the system, and then use a wrapper
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# stream that converts newlines. It's not quite clear what's the
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# correct option here.
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#
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# This code also lives in _winconsole for the fallback to the console
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# emulation stream.
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#
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# There are also Windows environments where the `msvcrt` module is not
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# available (which is why we use try-catch instead of the WIN variable
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# here), such as the Google App Engine development server on Windows. In
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# those cases there is just nothing we can do.
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def set_binary_mode(f):
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return f
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try:
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import msvcrt
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except ImportError:
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pass
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else:
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def set_binary_mode(f):
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try:
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fileno = f.fileno()
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except Exception:
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pass
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else:
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msvcrt.setmode(fileno, os.O_BINARY)
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return f
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try:
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import fcntl
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except ImportError:
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pass
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else:
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def set_binary_mode(f):
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try:
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fileno = f.fileno()
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except Exception:
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pass
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else:
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flags = fcntl.fcntl(fileno, fcntl.F_GETFL)
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fcntl.fcntl(fileno, fcntl.F_SETFL, flags & ~os.O_NONBLOCK)
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return f
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def isidentifier(x):
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return _identifier_re.search(x) is not None
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def get_binary_stdin():
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return set_binary_mode(sys.stdin)
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def get_binary_stdout():
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_wrap_std_stream('stdout')
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return set_binary_mode(sys.stdout)
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def get_binary_stderr():
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_wrap_std_stream('stderr')
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return set_binary_mode(sys.stderr)
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def get_text_stdin(encoding=None, errors=None):
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rv = _get_windows_console_stream(sys.stdin, encoding, errors)
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if rv is not None:
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return rv
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return _make_text_stream(sys.stdin, encoding, errors,
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force_readable=True)
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def get_text_stdout(encoding=None, errors=None):
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_wrap_std_stream('stdout')
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rv = _get_windows_console_stream(sys.stdout, encoding, errors)
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if rv is not None:
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return rv
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return _make_text_stream(sys.stdout, encoding, errors,
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force_writable=True)
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def get_text_stderr(encoding=None, errors=None):
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_wrap_std_stream('stderr')
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rv = _get_windows_console_stream(sys.stderr, encoding, errors)
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if rv is not None:
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return rv
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return _make_text_stream(sys.stderr, encoding, errors,
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force_writable=True)
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def filename_to_ui(value):
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if isinstance(value, bytes):
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value = value.decode(get_filesystem_encoding(), 'replace')
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return value
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else:
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import io
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text_type = str
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raw_input = input
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string_types = (str,)
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int_types = (int,)
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range_type = range
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isidentifier = lambda x: x.isidentifier()
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iteritems = lambda x: iter(x.items())
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def is_bytes(x):
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return isinstance(x, (bytes, memoryview, bytearray))
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def _is_binary_reader(stream, default=False):
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try:
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return isinstance(stream.read(0), bytes)
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except Exception:
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return default
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# This happens in some cases where the stream was already
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# closed. In this case, we assume the default.
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def _is_binary_writer(stream, default=False):
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try:
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stream.write(b'')
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except Exception:
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try:
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stream.write('')
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return False
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except Exception:
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pass
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return default
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return True
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def _find_binary_reader(stream):
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# We need to figure out if the given stream is already binary.
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# This can happen because the official docs recommend detaching
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# the streams to get binary streams. Some code might do this, so
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# we need to deal with this case explicitly.
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if _is_binary_reader(stream, False):
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return stream
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buf = getattr(stream, 'buffer', None)
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# Same situation here; this time we assume that the buffer is
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# actually binary in case it's closed.
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if buf is not None and _is_binary_reader(buf, True):
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return buf
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def _find_binary_writer(stream):
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# We need to figure out if the given stream is already binary.
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# This can happen because the official docs recommend detatching
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# the streams to get binary streams. Some code might do this, so
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# we need to deal with this case explicitly.
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if _is_binary_writer(stream, False):
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return stream
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buf = getattr(stream, 'buffer', None)
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# Same situation here; this time we assume that the buffer is
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# actually binary in case it's closed.
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if buf is not None and _is_binary_writer(buf, True):
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return buf
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def _stream_is_misconfigured(stream):
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"""A stream is misconfigured if its encoding is ASCII."""
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# If the stream does not have an encoding set, we assume it's set
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# to ASCII. This appears to happen in certain unittest
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# environments. It's not quite clear what the correct behavior is
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# but this at least will force Click to recover somehow.
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return is_ascii_encoding(getattr(stream, 'encoding', None) or 'ascii')
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def _is_compatible_text_stream(stream, encoding, errors):
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stream_encoding = getattr(stream, 'encoding', None)
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stream_errors = getattr(stream, 'errors', None)
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# Perfect match.
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if stream_encoding == encoding and stream_errors == errors:
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return True
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# Otherwise, it's only a compatible stream if we did not ask for
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# an encoding.
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if encoding is None:
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return stream_encoding is not None
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return False
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def _force_correct_text_reader(text_reader, encoding, errors,
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force_readable=False):
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if _is_binary_reader(text_reader, False):
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binary_reader = text_reader
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else:
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# If there is no target encoding set, we need to verify that the
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# reader is not actually misconfigured.
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if encoding is None and not _stream_is_misconfigured(text_reader):
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return text_reader
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if _is_compatible_text_stream(text_reader, encoding, errors):
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return text_reader
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# If the reader has no encoding, we try to find the underlying
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# binary reader for it. If that fails because the environment is
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# misconfigured, we silently go with the same reader because this
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# is too common to happen. In that case, mojibake is better than
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# exceptions.
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binary_reader = _find_binary_reader(text_reader)
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if binary_reader is None:
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return text_reader
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# At this point, we default the errors to replace instead of strict
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# because nobody handles those errors anyways and at this point
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# we're so fundamentally fucked that nothing can repair it.
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if errors is None:
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errors = 'replace'
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return _make_text_stream(binary_reader, encoding, errors,
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force_readable=force_readable)
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def _force_correct_text_writer(text_writer, encoding, errors,
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force_writable=False):
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if _is_binary_writer(text_writer, False):
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binary_writer = text_writer
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else:
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# If there is no target encoding set, we need to verify that the
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# writer is not actually misconfigured.
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if encoding is None and not _stream_is_misconfigured(text_writer):
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return text_writer
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if _is_compatible_text_stream(text_writer, encoding, errors):
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return text_writer
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|
||
|
|
# If the writer has no encoding, we try to find the underlying
|
||
|
|
# binary writer for it. If that fails because the environment is
|
||
|
|
# misconfigured, we silently go with the same writer because this
|
||
|
|
# is too common to happen. In that case, mojibake is better than
|
||
|
|
# exceptions.
|
||
|
|
binary_writer = _find_binary_writer(text_writer)
|
||
|
|
if binary_writer is None:
|
||
|
|
return text_writer
|
||
|
|
|
||
|
|
# At this point, we default the errors to replace instead of strict
|
||
|
|
# because nobody handles those errors anyways and at this point
|
||
|
|
# we're so fundamentally fucked that nothing can repair it.
|
||
|
|
if errors is None:
|
||
|
|
errors = 'replace'
|
||
|
|
return _make_text_stream(binary_writer, encoding, errors,
|
||
|
|
force_writable=force_writable)
|
||
|
|
|
||
|
|
def get_binary_stdin():
|
||
|
|
reader = _find_binary_reader(sys.stdin)
|
||
|
|
if reader is None:
|
||
|
|
raise RuntimeError('Was not able to determine binary '
|
||
|
|
'stream for sys.stdin.')
|
||
|
|
return reader
|
||
|
|
|
||
|
|
def get_binary_stdout():
|
||
|
|
writer = _find_binary_writer(sys.stdout)
|
||
|
|
if writer is None:
|
||
|
|
raise RuntimeError('Was not able to determine binary '
|
||
|
|
'stream for sys.stdout.')
|
||
|
|
return writer
|
||
|
|
|
||
|
|
def get_binary_stderr():
|
||
|
|
writer = _find_binary_writer(sys.stderr)
|
||
|
|
if writer is None:
|
||
|
|
raise RuntimeError('Was not able to determine binary '
|
||
|
|
'stream for sys.stderr.')
|
||
|
|
return writer
|
||
|
|
|
||
|
|
def get_text_stdin(encoding=None, errors=None):
|
||
|
|
rv = _get_windows_console_stream(sys.stdin, encoding, errors)
|
||
|
|
if rv is not None:
|
||
|
|
return rv
|
||
|
|
return _force_correct_text_reader(sys.stdin, encoding, errors,
|
||
|
|
force_readable=True)
|
||
|
|
|
||
|
|
def get_text_stdout(encoding=None, errors=None):
|
||
|
|
rv = _get_windows_console_stream(sys.stdout, encoding, errors)
|
||
|
|
if rv is not None:
|
||
|
|
return rv
|
||
|
|
return _force_correct_text_writer(sys.stdout, encoding, errors,
|
||
|
|
force_writable=True)
|
||
|
|
|
||
|
|
def get_text_stderr(encoding=None, errors=None):
|
||
|
|
rv = _get_windows_console_stream(sys.stderr, encoding, errors)
|
||
|
|
if rv is not None:
|
||
|
|
return rv
|
||
|
|
return _force_correct_text_writer(sys.stderr, encoding, errors,
|
||
|
|
force_writable=True)
|
||
|
|
|
||
|
|
def filename_to_ui(value):
|
||
|
|
if isinstance(value, bytes):
|
||
|
|
value = value.decode(get_filesystem_encoding(), 'replace')
|
||
|
|
else:
|
||
|
|
value = value.encode('utf-8', 'surrogateescape') \
|
||
|
|
.decode('utf-8', 'replace')
|
||
|
|
return value
|
||
|
|
|
||
|
|
|
||
|
|
def get_streerror(e, default=None):
|
||
|
|
if hasattr(e, 'strerror'):
|
||
|
|
msg = e.strerror
|
||
|
|
else:
|
||
|
|
if default is not None:
|
||
|
|
msg = default
|
||
|
|
else:
|
||
|
|
msg = str(e)
|
||
|
|
if isinstance(msg, bytes):
|
||
|
|
msg = msg.decode('utf-8', 'replace')
|
||
|
|
return msg
|
||
|
|
|
||
|
|
|
||
|
|
def open_stream(filename, mode='r', encoding=None, errors='strict',
|
||
|
|
atomic=False):
|
||
|
|
# Standard streams first. These are simple because they don't need
|
||
|
|
# special handling for the atomic flag. It's entirely ignored.
|
||
|
|
if filename == '-':
|
||
|
|
if any(m in mode for m in ['w', 'a', 'x']):
|
||
|
|
if 'b' in mode:
|
||
|
|
return get_binary_stdout(), False
|
||
|
|
return get_text_stdout(encoding=encoding, errors=errors), False
|
||
|
|
if 'b' in mode:
|
||
|
|
return get_binary_stdin(), False
|
||
|
|
return get_text_stdin(encoding=encoding, errors=errors), False
|
||
|
|
|
||
|
|
# Non-atomic writes directly go out through the regular open functions.
|
||
|
|
if not atomic:
|
||
|
|
if encoding is None:
|
||
|
|
return open(filename, mode), True
|
||
|
|
return io.open(filename, mode, encoding=encoding, errors=errors), True
|
||
|
|
|
||
|
|
# Some usability stuff for atomic writes
|
||
|
|
if 'a' in mode:
|
||
|
|
raise ValueError(
|
||
|
|
'Appending to an existing file is not supported, because that '
|
||
|
|
'would involve an expensive `copy`-operation to a temporary '
|
||
|
|
'file. Open the file in normal `w`-mode and copy explicitly '
|
||
|
|
'if that\'s what you\'re after.'
|
||
|
|
)
|
||
|
|
if 'x' in mode:
|
||
|
|
raise ValueError('Use the `overwrite`-parameter instead.')
|
||
|
|
if 'w' not in mode:
|
||
|
|
raise ValueError('Atomic writes only make sense with `w`-mode.')
|
||
|
|
|
||
|
|
# Atomic writes are more complicated. They work by opening a file
|
||
|
|
# as a proxy in the same folder and then using the fdopen
|
||
|
|
# functionality to wrap it in a Python file. Then we wrap it in an
|
||
|
|
# atomic file that moves the file over on close.
|
||
|
|
import tempfile
|
||
|
|
fd, tmp_filename = tempfile.mkstemp(dir=os.path.dirname(filename),
|
||
|
|
prefix='.__atomic-write')
|
||
|
|
|
||
|
|
if encoding is not None:
|
||
|
|
f = io.open(fd, mode, encoding=encoding, errors=errors)
|
||
|
|
else:
|
||
|
|
f = os.fdopen(fd, mode)
|
||
|
|
|
||
|
|
return _AtomicFile(f, tmp_filename, os.path.realpath(filename)), True
|
||
|
|
|
||
|
|
|
||
|
|
# Used in a destructor call, needs extra protection from interpreter cleanup.
|
||
|
|
if hasattr(os, 'replace'):
|
||
|
|
_replace = os.replace
|
||
|
|
_can_replace = True
|
||
|
|
else:
|
||
|
|
_replace = os.rename
|
||
|
|
_can_replace = not WIN
|
||
|
|
|
||
|
|
|
||
|
|
class _AtomicFile(object):
|
||
|
|
|
||
|
|
def __init__(self, f, tmp_filename, real_filename):
|
||
|
|
self._f = f
|
||
|
|
self._tmp_filename = tmp_filename
|
||
|
|
self._real_filename = real_filename
|
||
|
|
self.closed = False
|
||
|
|
|
||
|
|
@property
|
||
|
|
def name(self):
|
||
|
|
return self._real_filename
|
||
|
|
|
||
|
|
def close(self, delete=False):
|
||
|
|
if self.closed:
|
||
|
|
return
|
||
|
|
self._f.close()
|
||
|
|
if not _can_replace:
|
||
|
|
try:
|
||
|
|
os.remove(self._real_filename)
|
||
|
|
except OSError:
|
||
|
|
pass
|
||
|
|
_replace(self._tmp_filename, self._real_filename)
|
||
|
|
self.closed = True
|
||
|
|
|
||
|
|
def __getattr__(self, name):
|
||
|
|
return getattr(self._f, name)
|
||
|
|
|
||
|
|
def __enter__(self):
|
||
|
|
return self
|
||
|
|
|
||
|
|
def __exit__(self, exc_type, exc_value, tb):
|
||
|
|
self.close(delete=exc_type is not None)
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return repr(self._f)
|
||
|
|
|
||
|
|
|
||
|
|
auto_wrap_for_ansi = None
|
||
|
|
colorama = None
|
||
|
|
get_winterm_size = None
|
||
|
|
|
||
|
|
|
||
|
|
def strip_ansi(value):
|
||
|
|
return _ansi_re.sub('', value)
|
||
|
|
|
||
|
|
|
||
|
|
def should_strip_ansi(stream=None, color=None):
|
||
|
|
if color is None:
|
||
|
|
if stream is None:
|
||
|
|
stream = sys.stdin
|
||
|
|
return not isatty(stream)
|
||
|
|
return not color
|
||
|
|
|
||
|
|
|
||
|
|
# If we're on Windows, we provide transparent integration through
|
||
|
|
# colorama. This will make ANSI colors through the echo function
|
||
|
|
# work automatically.
|
||
|
|
if WIN:
|
||
|
|
# Windows has a smaller terminal
|
||
|
|
DEFAULT_COLUMNS = 79
|
||
|
|
|
||
|
|
from ._winconsole import _get_windows_console_stream, _wrap_std_stream
|
||
|
|
|
||
|
|
def _get_argv_encoding():
|
||
|
|
import locale
|
||
|
|
return locale.getpreferredencoding()
|
||
|
|
|
||
|
|
if PY2:
|
||
|
|
def raw_input(prompt=''):
|
||
|
|
sys.stderr.flush()
|
||
|
|
if prompt:
|
||
|
|
stdout = _default_text_stdout()
|
||
|
|
stdout.write(prompt)
|
||
|
|
stdin = _default_text_stdin()
|
||
|
|
return stdin.readline().rstrip('\r\n')
|
||
|
|
|
||
|
|
try:
|
||
|
|
import colorama
|
||
|
|
except ImportError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
_ansi_stream_wrappers = WeakKeyDictionary()
|
||
|
|
|
||
|
|
def auto_wrap_for_ansi(stream, color=None):
|
||
|
|
"""This function wraps a stream so that calls through colorama
|
||
|
|
are issued to the win32 console API to recolor on demand. It
|
||
|
|
also ensures to reset the colors if a write call is interrupted
|
||
|
|
to not destroy the console afterwards.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
cached = _ansi_stream_wrappers.get(stream)
|
||
|
|
except Exception:
|
||
|
|
cached = None
|
||
|
|
if cached is not None:
|
||
|
|
return cached
|
||
|
|
strip = should_strip_ansi(stream, color)
|
||
|
|
ansi_wrapper = colorama.AnsiToWin32(stream, strip=strip)
|
||
|
|
rv = ansi_wrapper.stream
|
||
|
|
_write = rv.write
|
||
|
|
|
||
|
|
def _safe_write(s):
|
||
|
|
try:
|
||
|
|
return _write(s)
|
||
|
|
except:
|
||
|
|
ansi_wrapper.reset_all()
|
||
|
|
raise
|
||
|
|
|
||
|
|
rv.write = _safe_write
|
||
|
|
try:
|
||
|
|
_ansi_stream_wrappers[stream] = rv
|
||
|
|
except Exception:
|
||
|
|
pass
|
||
|
|
return rv
|
||
|
|
|
||
|
|
def get_winterm_size():
|
||
|
|
win = colorama.win32.GetConsoleScreenBufferInfo(
|
||
|
|
colorama.win32.STDOUT).srWindow
|
||
|
|
return win.Right - win.Left, win.Bottom - win.Top
|
||
|
|
else:
|
||
|
|
def _get_argv_encoding():
|
||
|
|
return getattr(sys.stdin, 'encoding', None) or get_filesystem_encoding()
|
||
|
|
|
||
|
|
_get_windows_console_stream = lambda *x: None
|
||
|
|
_wrap_std_stream = lambda *x: None
|
||
|
|
|
||
|
|
|
||
|
|
def term_len(x):
|
||
|
|
return len(strip_ansi(x))
|
||
|
|
|
||
|
|
|
||
|
|
def isatty(stream):
|
||
|
|
try:
|
||
|
|
return stream.isatty()
|
||
|
|
except Exception:
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def _make_cached_stream_func(src_func, wrapper_func):
|
||
|
|
cache = WeakKeyDictionary()
|
||
|
|
def func():
|
||
|
|
stream = src_func()
|
||
|
|
try:
|
||
|
|
rv = cache.get(stream)
|
||
|
|
except Exception:
|
||
|
|
rv = None
|
||
|
|
if rv is not None:
|
||
|
|
return rv
|
||
|
|
rv = wrapper_func()
|
||
|
|
try:
|
||
|
|
stream = src_func() # In case wrapper_func() modified the stream
|
||
|
|
cache[stream] = rv
|
||
|
|
except Exception:
|
||
|
|
pass
|
||
|
|
return rv
|
||
|
|
return func
|
||
|
|
|
||
|
|
|
||
|
|
_default_text_stdin = _make_cached_stream_func(
|
||
|
|
lambda: sys.stdin, get_text_stdin)
|
||
|
|
_default_text_stdout = _make_cached_stream_func(
|
||
|
|
lambda: sys.stdout, get_text_stdout)
|
||
|
|
_default_text_stderr = _make_cached_stream_func(
|
||
|
|
lambda: sys.stderr, get_text_stderr)
|
||
|
|
|
||
|
|
|
||
|
|
binary_streams = {
|
||
|
|
'stdin': get_binary_stdin,
|
||
|
|
'stdout': get_binary_stdout,
|
||
|
|
'stderr': get_binary_stderr,
|
||
|
|
}
|
||
|
|
|
||
|
|
text_streams = {
|
||
|
|
'stdin': get_text_stdin,
|
||
|
|
'stdout': get_text_stdout,
|
||
|
|
'stderr': get_text_stderr,
|
||
|
|
}
|